I haven't had a tank up for some time, like 8 years. It seems like lighting has changed a lot. I have two 250 watt MH electronic ballists. I was looking for some bulbs. All the bulbs seem to be very a high kelvin rating. I don't like the way that looks. Can I get a good recomendation for a 5500k bulb?
The popularity of the low K high PAR bulbs is down in favor of the higher K bulbs. The basic reason for this is more people are interested in bringing out the florescense in there coral than rapid coral growth. Add to that the popularity of T-5 lighting where you get roughly the same amount of light for about 75% of the electric bill. Then the new addition of LED comming into the picture where you have bulb life of 5 plus years and an even greater reduction in the electric bill. So for a distributor to decide what to stock he looks at what is selling the fastest for him. If he stocks 100 metal hide bulbs as sees 70% of his sales are for 20,000K bulbs he will stock them before he stocks the 6,500K bulbs. But the 6,500K metal hide bulbs are still out there being manufactured.
From the new reefer he weighs out all the aspects of lighting and today is putting operating cost as a strong factor. This operating cost includes bulb replacement cost as well as his electric bill. On this cost bases the newer LED's win easily. However for the individual with an already functional lighting system this is not always the case or takes a considerable lenght of time to balance out switching.
As a quick comparison
2 250 Watt MH with Atinic T-5 suplements of 108 Watts means your using about $240 worth of electricity a year, plus plus another $120 in bulb replacement costs for an operating cost of $360
6 T-5 Bubls at 54 watts each will cost your $180 worth of electricity plus $150 in bulb replacement costs for $330 a year.
Finaly a LEd lighting system with 240 Watts of electricity would cost you $130 in electricity and no bulb replacement cost in 5 years.
While the quality of light is very simular each has its advantages and disanvantages. But ifwe look over 5 years of operation from the LED's as being the most economical we spend an aditional $1,000 using T-5's and an aditional $1,130 using MH's.
Now your want to weigh this against the cost of upgrading and for most people it is wash over 5 years. But if your building from scratch the difference in initial cost is a big factor as LED's cost initialy more than MH's or T-5's unless you build the system yourself.